OpenAIAuto-detected

GPT-5.5 Instant

Name: GPT-5.5 Instant benchmark results
Creator: BenchLeader

Best configuration ranks #87 of 610 on the BenchLeader Index at 60.4 ±5.6. Last measured 2 Sept 2026. Released 5 May 2026.

Blended price: $11.25/M; $5.00 in · $30.00 out
Output speed: 135 tok/s
First answer: 16 s
Context: 400k

How it scores by categoryDashed line = average model (50). One step of 15 = one standard deviation.

Overall index60
Reasoning62
Coding61
Agents & tools71
Maths43
Knowledge69
Instruction following70
Human preference67
Multimodal60
Long context61
Composite63

Benchmark results

One column per reasoning effort. Rank is among every configuration of every model on that benchmark. Hover a score for the run it came from.

Reasoning

Benchmark	default	Source
GPQA Diamond	82.5%#100	Epoch AI Benchmarking Hub
LMArena Hard Prompts	1491#39	LMArena
GPQA Diamond (AA)not in index	84.7%#134	Artificial Analysis
Humanity's Last Exam (AA)not in index	21.6%#152	Artificial Analysis

Coding

Benchmark	default	Source
SciCode	48.6%#69	SciCode
LMArena Coding	1514#38	LMArena
SciCode (AA)not in index	52.5%#52	Artificial Analysis

Agents & tools

Benchmark	default	Source
Terminal-Bench Hard	42.4%#44	Artificial Analysis
τ²-Bench Telecom (AA)not in index	49.4%#192	Artificial Analysis

Maths

Benchmark	default	Source
FrontierMath Tiers 1–3	26.3%#63	Epoch AI Benchmarking Hub
FrontierMath Tier 4	2.4%#53	Epoch AI Benchmarking Hub
OTIS Mock AIME	68.1%#131	Epoch AI Benchmarking Hub

Knowledge

Benchmark	default	Source
AA-Omniscience	11.2#61	Artificial Analysis

Instruction following

Benchmark	default	Source
IFBench	71.5%#54	Artificial Analysis

Human preference

Benchmark	default	Source
LMArena Text	1474#31	LMArena

Multimodal

Benchmark	default	Source
LMArena Vision	1251#48	LMArena

Long context

Benchmark	default	Source
AA-LCR	70.0%#161	Artificial Analysis

Composite

Benchmark	default	Source
Epoch Capabilities Indexnot in index	142.5#86	Epoch AI Benchmarking Hub
AA Intelligence Index	26.8#102	Artificial Analysis

What a task costs

Estimates from list price, output speed and time to first answer for the best configuration. “With caching” assumes three-quarters of the input is served from the prompt cache. Reasoning tokens are not modelled.

Workload	Tokens in / out	Cost	With caching	Time
Chat reply	400 / 300	$0.011	–	18.2 s
Summarise a 30-page report	12,000 / 600	$0.078	–	20.4 s
Code edit	6,000 / 1,500	$0.075	–	27.1 s
Agentic coding session	60,000 / 4,000	$0.420	–	45.6 s
Structured extraction	2,000 / 200	$0.016	–	17.5 s